We propose an explanation for the recently reported ultrahigh-energy neutrino signal at KM3NeT, which shows no clear association with known astrophysical sources. While decaying dark matter in the Galactic Center is a natural candidate, the observed arrival direction strongly suggests an extragalactic origin. We introduce a multicomponent dark matter scenario in which the components are part...
Dark matter (DM) annihilation can power the first generation of stars as long lived dark stars (DSs) that grow to supermassive scales $M_{\rm DS}\gtrsim 10^{5} M_{\odot}$ and eventually collapse into heavy black holes that could seed the supermassive black holes observed at high redshifts. We compute the electromagnetic and neutrino emission from these objects and determine the diffuse...
Sterile neutrinos are well-motivated candidates for dark matter. In particular, sterile neutrino dark matter in the MeV mass range has recently attracted increasing attention due to the prospects of future indirect detection experiments. In this work, we focus on the Compton Spectrometer and Imager (COSI) as a next-generation gamma-ray detector and investigate the detectability of MeV-scale...
